feat(navigation): Enhance navigation links and add legacy route redirects

- Updated navigation links in `init_db.py` to include href overrides and parent slugs for profitability, opex, and capex planners.
- Modified `NavigationService` to handle child links and href overrides, ensuring proper routing when context is missing.
- Adjusted scenario detail and list templates to use new route names for opex and capex forms, with legacy fallbacks.
- Introduced integration tests for legacy calculation routes to ensure proper redirection and error handling.
- Added tests for navigation sidebar to validate role-based access and link visibility.
- Enhanced navigation sidebar tests to include calculation links and contextual URLs based on project and scenario IDs.

templates/scenarios/list.html

@@ -97,8 +97,8 @@
         <ul class="scenario-list">
           {% for scenario in scenarios %}
             {% set profitability_href = url_for('calculations.profitability_form', project_id=project.id, scenario_id=scenario.id) %}
-            {% set opex_href = url_for('calculations.opex_form') ~ '?project_id=' ~ project.id ~ '&scenario_id=' ~ scenario.id %}
-            {% set capex_href = url_for('calculations.capex_form') ~ '?project_id=' ~ project.id ~ '&scenario_id=' ~ scenario.id %}
+            {% set opex_href = url_for('calculations.scenario_opex_form', project_id=project.id, scenario_id=scenario.id) %}
+            {% set capex_href = url_for('calculations.scenario_capex_form', project_id=project.id, scenario_id=scenario.id) %}
             <li class="scenario-item">
               <div class="scenario-item__body">
                 <div class="scenario-item__header">